Correct answer will be - The bystander effect.
The bystander effect describes how being among other individuals reduces one's propensity to help a stranger. According to research, even in an emergency, a bystander is less likely to offer assistance when they are in the actual or imagined company of others than when they are by themselves.
When other people prevent someone from intervening in an emergency, standing up to a bully, or participating in an assault or other crime because they are present, this is known as the bystander effect. The greater the number of onlookers, the less probable it is that any of them will intervene to help someone in need.
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